Packaging Printing Methods Explained: Choosing the Right Process

Why the printing method decision comes first

Consider the printing method alongside the package structure, substrate, artwork and finishing plan. These choices interact, so discuss feasible production routes with your converter before locking the design.

Modern prepress systems handle much of this complexity. Adobe describes its PDF Print Engine as the rendering core inside leading prepress products, converting the graphics, text and images in the package PDF into rasters, one for each ink, matched to the resolution of the platesetter or digital press. That means the same PDF can drive very different output devices, but the job still has to be prepared with the target condition in mind.

Flexography: the workhorse for film, labels and corrugate

Flexography uses flexible relief plates mounted on rotating cylinders to transfer ink. It is a process to discuss for film, labels and corrugated packaging. Ask the converter to confirm substrate compatibility, reproduction limits and pricing for your artwork and quantity rather than assuming a fixed quality or cost advantage.

When comparing quotes, check whether preparation costs are itemized or included in the unit price. Teal Packaging does not charge setup, plate or tooling fees. That policy alone does not establish which printing process is available or most economical for a specific job.

• Applications to discuss: flexible film pouches, labels, corrugated shippers and bags
• Confirm: production capacity, substrate compatibility and ink suitability for the intended use
• Ask about: minimum text and line sizes, tonal reproduction and substrate-specific compensation

Offset lithography: fine detail for folding cartons

Offset lithography transfers ink from a plate to a rubber blanket and then to the substrate. Consider it with your converter for paperboard cartons or labels with detailed artwork. Confirm the actual reproduction capability, make-ready costs and quantity pricing; the cited sources do not establish a universal setup-time or run-length ranking against flexo or digital.

If the design includes spot varnish, foil or embossing, ask the converter whether the proposed print and finishing route supports it. Request instructions for defining finishing separations and registration targets in the artwork.

Digital press printing: short runs and variable data

Digital presses print from digital data without conventional printing plates. Consider digital for market tests, multiple versions or variable data, but confirm minimum quantities, economics and the press's capabilities with the converter. For batch codes or serialized numbers, also agree on the data format and checking procedure.

Compare the proposed digital system's substrate compatibility, color gamut and total job price with the other quoted routes. A named spot color may be simulated with available inks rather than printed as a dedicated ink. Confirm the intended color treatment and proofing approach instead of assuming that the spot-color name guarantees a match.

• Consider for: short runs, versioning and variable data, subject to capability checks and quotes
• Planning advantage: no conventional printing plates; confirm how artwork versions are handled
• Watch for: color gamut, substrate limits, unit cost at scale

Screen printing and specialty decoration

Screen printing pushes ink through a mesh stencil onto a substrate. Consider it with the converter for opaque coverage or specialty decoration on suitable rigid items. Confirm achievable coverage, ink adhesion, color passes and production costs. Foil stamping, embossing and soft-touch coatings are finishing options whose compatibility with the substrate, inks and production route must be checked; they cannot be assumed to work with every printing method.

How prepress and your PDF interact with each method

For workflows using Adobe PDF Print Engine, Adobe describes rendering PDF graphics into per-ink rasters at the platesetter or digital press resolution. This does not establish that every printer uses that engine or accepts the same handoff format. Industry groups such as the Ghent PDF Workgroup recommend PDF and PDF/X for packaging and label exchange, and Adobe provides PDF/X-4 conversion guidance. Confirm the converter's required PDF specification and export settings.

Note that PDF/X-4 can carry color-managed RGB content; whether RGB is converted before handoff depends on the agreed workflow with your printer, not a universal rule. Use Acrobat's Output Preview to check separations, ink coverage and color warnings before handoff, and its printer marks tools only if your converter asks for embedded marks. Adobe cautions that onscreen separation preview does not show trapping, emulsion, marks, halftone screens or resolution, which must be verified with your print provider using proofs.

• Confirm with the converter: target color space at handoff, ink limits, spot handling, marks policy, proof type
• Check in Output Preview: separations, total area coverage, rich black on small type, spot color usage
• Remember: registration black and rich black are different objects with different consequences

Worked example: choosing a method for a hypothetical coffee bag

Suppose a hypothetical brand needs 5,000 stand-up coffee bags with a five-color design. All figures are hypothetical, not quotes or market benchmarks. Assume a hypothetical supplier charges 200 dollars per flexo plate for five plates, plus 100 dollars setup, with a variable cost of 0.18 dollars per bag. Assume a digital alternative costs 0.42 dollars per bag with no fixed charge. For this arithmetic only, assume equivalent acceptable results and identical included scope, with no additional finishing, waste, shipping or other charges. Teal does not charge setup, plate or tooling fees; these hypothetical supplier charges are not a Teal quote.

Five hypothetical plates cost 1,000 dollars. Add 100 dollars setup and 5,000 times 0.18 dollars, or 900 dollars, for a flexo total of 2,000 dollars: 0.40 dollars per bag. Digital totals 2,100 dollars at 0.42 dollars per bag. The variable-cost difference is 0.24 dollars per bag, while the effective saving at 5,000 bags is only 0.02 dollars per bag, or 100 dollars total. The break-even quantity is 1,100 divided by 0.24, approximately 4,583.33 bags; at whole-unit quantities, flexo first becomes cheaper at 4,584 bags under these assumptions. If a metallic accent is required, obtain quotes for equivalent approved effects and include any extra materials, passes or finishing before repeating the comparison. A process-color approximation is not necessarily a metallic effect.

Check the arithmetic: 1,000 plus 100 plus 900 equals 2,000. Divide 2,000 by 5,000 to get 0.40 dollars per bag. Digital: 5,000 times 0.42 equals 2,100 dollars.

Decision table

Pre-handoff checklist

This checklist is Teal's editorial planning framework; the cited sources cover only the underlying prepress principles, not your specific job.

Ask your converter to confirm each item in writing before you send final art.

• Run length, substrate and press type confirmed with the converter
• Color strategy agreed: process, spot or extended gamut, and where conversion happens
• Printer-specified total ink limit checked in Output Preview, with rich black usage reviewed
• Spot colors named consistently and any spectral or CxF data supplied if the printer requests it
• Page boxes, bleed and marks follow the converter's instructions; dielines and other nonprinting technical elements are separated or excluded from print output as requested
• Proof type agreed: contract proof, imposition proof or soft proof, per the printer's workflow
• Finishing effects such as varnish or foil specified in the file so they align with printed graphics

Scope limits

This guide covers method selection and file preparation at a planning level. It does not determine press suitability for a regulated product, food contact compliance, or exact color tolerances for your brand. Those require your converter's specifications and, where applicable, regulatory review. Cost figures in the worked example are hypothetical arithmetic only, not quotes or market benchmarks. Contact Teal for current pricing and sample options.

Questions about packaging printing methods